which condition does a alternator normally chare the battery
Answers
Answer: Mechanical energy from the engine causes the alternator rotor to turn, and this makes the electron pixies in the alternator very excited and they begin to dance and jump. As the alternator rotor turns faster and faster, the electron pixies are jumping higher and higher.
Meanwhile, the battery has electron pixies which jump to a certain height caused by the chemistry within the battery. There is a thick copper wire connected between the alternator and the battery, and when the alternator pixies jump higher than the battery pixies, there is a net migration of pixies from the alternator to the battery. The pixies move into the battery and make a nice chemical home for themselves until there is very little spare space for them. The alternator regulator senses this and calms its own pixies down a bit, eventually causing no more electron pixies to move into the battery.
Charge can mean instantaneous rate (where the pixie flow is measured in Amps) or it can mean stored energy (the pixie flow integrated over a period of time). Many automotive alternators can put out a pixie flow of 75 to 125 Amps, and can do this continuously. If an alternator tried to push 100 Amps of pixie flow into a typical automotive battery, the battery would become fully charges in less than an hour. Some RV and truck alternators can create an electron pixie flow of up to 200 Amps.
The alternator’s main job is to recharge the starting battery; its secondary job is to supply all the pixies needed to operate the vehicle’s lighting, passenger comfort, entertainment, safety, communications and vehicle management systems.
In days of old, when you could actually see individual components in your engine bay, electron pixie generators (alternators) made for beautifully chromed objets d'art.